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Which expression is equivalent to cos (70°)? Cos ^-1 (20) Sin ^-1 (20) Cos (20) Sin (20)
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Which expression is equivalent to cos (70°)?

Cos ^-1 (20)


Sin ^-1 (20)


Cos (20)


Sin (20)

User Woutervs
by
8.0k points

1 Answer

4 votes

Answer:

sin20°

Explanation:

Using the cofunction identity

cosx = sin(90 - x) , thus

cos70° = sin(90 - 70)° = sin20°

User SnelleJelle
by
9.2k points
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